Thymic wave sign

Last revised by Dr Mostafa El-Feky on 19 Oct 2021

Thymic wave sign refers to the indentation of the normal thymus in young children by the ribs, resulting in a wavy border on chest radiograph. 

There are at least 3 described signs relating to a normal thymus in infants; thymic sail signthymic notch sign and thymic wave sign. Being able to identify the signs helps in preventing overcalling the cardiothymic silhouette. 

See also

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Cases and figures

  • Case 1
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  • Case 2
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  • Case 3
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  • Case 4: with bronchiolitis
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  • Case 5
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